Question

This is for a mathematical method that takes in 3 doubles as input (a, b,c ).

Next those 3 values get calculated in a formula (abc formula for square roots).

The formula has 2 values that have to be returned but how exactly do i do this?

I was thinking of a array / objects, but not sure how to initialise them for this purpose. Out parameters are not really of any use in this situation are they?

Regards.

Answer 1

In C# 4 (available in Visual Studio 2010):

Tuple<double, double> Foo(double a, double b, double c)
{
   ...
   return Tuple.Create(firstReturnValue, secondReturnValue);
}

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If you’re working with an earlier language version of C#, you can define your own implementation of a two-tuple (pair) as follows:

public struct Tuple<A, B>
{
   public readonly A Item1;
   public readonly B Item2;
   public Tuple(A a, B b) { Item1 = a; Item2 = b; }
}
public static class Tuple
{
   public static Tuple<A,B> Create<A,B>(A a, B b) { return new Tuple<A,B>(a,b); }
}

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Of course, Tuple is a very general and unspecific data type. You could just as well implement a composite return type (similar to what I just showed, but simpler) that is more specific to your situation.